TIE-ON SURGICAL MASKS, 50/BOXTIE-ON SURGICAL MASK. FLUID RESISTANT, TIE-ON MASKS FOR GENERAL SURGICAL AND PATIENT CARE USE. THE MASKS HAVE 99% BACTERIAL FILTRATION EFFICIENCY AND 95% 0.1 MICRON FILTRATION EFFICIENCY. Manufacturer: 3M Healthcare (88) - One of the world leaders in manufacturing and distribution of healthcare equipment and supplies.